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Can I replace underground condensate black pipe w copper
Hello. I have a 1 pipe steam boiler and one of my 2 condensate lines goes underground. I replaced it in 94 when it rusted but only got 25 years out of it before it rusted/leaked again. I insulated it but I guess not good enough though much of the pipe still looks good. I was wondering if it would be acceptable to use black pipe and transition to copper below the water line and underground as installation would be much easier. If ok do I need to match the current condensate pipe size (1 1/2 inch) or can I go with 1 inch or 3/4 inch below the water line as it would be cheaper? I'm also assuming copper underground would last longer. Thanks.